im trying to figure out if the bigger the resistor the more power it lets through or the mor power it blockes?

 

The physical size of a resistor determines how much heat it can transfer to air.
Its value (the number of ohms) and the voltage or current determines how much it "blocks" or passes current flow.

 

Ohm's Law will help you understand the relationships between resistance, current and voltage.
1 volt across 1 Ohm's resistance = 1 Ampere of current and 1 Watt of power.
I=E/R; P=EI
E=IR
R=E/I
Etc.
It's a good idea to double your power requirement when selecting a wattage rating; that ensures your resistors will be able to dissipate the power.

If you needed to use a 100 Ohm resistor with 10v across it, then the current would be 10/100 = 0.1A (100mA), and you would select a resistor that was rated for 10v*0.1A=1 Watt; double it for reliability = 2 Watts.

http://www.allaboutcircuits.com/vol_1/chpt_2/1.html

 

Hello,

Also this page will give you information about size and power:
http://www.piclist.com/images/www/hobby_elec/e_resistor.htm

This is a link from the Resistors page from the EDUCYPEDIA.

Bertus